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From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Interval Comparisons
Date: Tue, 4 Jun 2024 17:54:33 +0100
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On 04/06/2024 17:25, Michael S wrote:
> On Tue, 4 Jun 2024 16:58:43 +0100
> bart <bc@freeuk.com> wrote:
> 
>> On 04/06/2024 16:27, Scott Lurndal wrote:
>>> David Brown <david.brown@hesbynett.no> writes:
>>>> On 04/06/2024 13:23, bart wrote:
>>>    
>>>>> It is incredibly useful:
>>>>>
>>>>>       if c in [' ', '\t', '\n'] then ... # whitespace
>>>
>>> if (strpbrk(c, " \t\n") != NULL) it_is_whitespace.
>>
>> That doesn't do the same thing. In my example, c is a character, not
>> a string.
>>
> 
> 
> Will that be be better?
> if (memchr(" \t\n", c, 3) != NULL)
> 

It's a better match. But on gcc-O3, it still calls the library function 
up to version 12.x. After that, it's smart enough to generate similar 
code to my non-optimising compiler using the built-in feature.

It is also still limited to byte values.

My approach is to fix a language, which is easier, than to expend 
magnitudes more effort in elaborate tools and ultra-smart compilers.